php compiler error is relative to XCache, as it make the file not cachable, hurting performance

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compiler failure is relative to XCache as it make the file not cachable (and not usable of course). it's true we can see it in error_log, but let's make it easier for beginners who don't know how to set up error_log/display_errors

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it's true we can see it in error_log, but let's make it easier for beginners by telling them there is compiler errors, and guide them to tune error_log/display_errors etc in online help doc.